Gear Change
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New User
Joined: Oct 2012
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Gear Change
I recently bought an 05 Lariat with a 3:55 rear end. I am looking to change that out to a 3:05 to increase my fuel mileage. What kind of gain can I expect after I do this. The truck has the 5.4 engine and runs really well I just need to get better mpg. Any thoughts or ideas would be appreciated.
Senior User
Joined: May 2010
Posts: 295
Likes: 5
From: Somerset, KY
I would have to agree with this. Gear changes are expensive. If you have a 4x4, you can double the price as well. Plus, I think you will beat yourself up over the performance decrease you would get. 3:05s are going to suck on the performance end.
Lead Driver
Joined: Jun 2005
Posts: 8,475
Likes: 727
From: Calgary Canada
First question should be, what mileage do you currently get, in what kind of driving, how heavy is your foot.
Drive for a week with a very light foot, and re-calculate your mileage again.
Drive for a week with a very light foot, and re-calculate your mileage again.
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 151
From: SE Georgia
1. Expense: figure about $700 per axle
2. Economy: on paper you should see a MPG gain, but in reality you will see it go down. Your motor in overdrive is designed to work at a certain rpm. Raising the gear ratio will drop it out of that rpm range. You'll be lucky if it can maintain 4th at 60 mph
2. Economy: on paper you should see a MPG gain, but in reality you will see it go down. Your motor in overdrive is designed to work at a certain rpm. Raising the gear ratio will drop it out of that rpm range. You'll be lucky if it can maintain 4th at 60 mph
Postmaster
Joined: Jan 2010
Posts: 4,329
Likes: 4
From: manchester,ct
I agree with the rest, gears are not a cost effective mpg saver. Driving style will help more than anything.
Also, if you want good gas mileage a full size truck was a poor choice
Also, if you want good gas mileage a full size truck was a poor choice
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New User
Joined: Feb 2007
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I have a 2007 F150 V6 5 Speed, I changed the gear ratio from 3.31 to 3.73 and my gas mileage improved. The change you are contemplating will disappoint you from both a performance and economy perspective.
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I recently bought an 05 Lariat with a 3:55 rear end. I am looking to change that out to a 3:05 to increase my fuel mileage. What kind of gain can I expect after I do this. The truck has the 5.4 engine and runs really well I just need to get better mpg. Any thoughts or ideas would be appreciated.
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